If you are thinking of doing any thing like that, I would strongly suggest getting certified with NRA and some kind of action shooting club like USPSA or IDPA as a range officer. The RO course will teach you a lot of practical stuff about keeping track of a crowd with novice shooters and not getting shot. - I'm planning to take such a course myself as soon as I can manage. I've helped out a little at the IDPA meets and watch the powerfactor show to learn tips and tricks. Having run paintball matches, and big events of other kinds and just seeing what it takes to keep 15 or 20 strangers with firearms organized, I think a class on being an RO would be invaluable.